After graduation from high school over half of american student center institutions of higher education. the system of higher education in the usa includes four categories of institutions: a community college, a technical training institution, a four-year college and a university. 24generally speaking, there is not much difference between these institutions of higher education. usually, a university is larger than a college - it offers a greater variety of subjects to specialize in. moreover,a university offers special programmes of advanced studies in addition to fundamental programmes. there are … categories of institutions in the usa.